Originally I was trying to find a grooveshark addon for Banshee Music Player, while looking for that I found a surprise in the Ubuntu Repositories which include Banshee Community Extensions. Here is the list of extensions included:

The following extensions are developed mostly by third-parties, and are not vetted by the core Banshee developers (though that will probably change over time).

Alarm Clock – You can use Banshee to wake up or go to sleep to a selection of your own music.

Ampache – Browse and play your remote music with Ampache.

AppIndicator – Use the new application indicator area available in Ubuntu.

Awn – Sets the current album cover as banshee icon in awn.

ClutterFlow – A CoverFlow clone that allows you to browse your album collection.

Cover Wallpaper – Sets the current playing album cover as the GNOME desktop wallpaper.